Selective system and apparatus therefor



y E. E, KLElNSCHMlDT I SELECTIVE SYSTEM AND APPARATUS THEREFOR OriginalFiled Nov. 18, 1924 4 Sheets-Sheet l gwuantoz (mam y 1932- E. E;KLEINSCHMIDT 1,860,464

SELECTIVE SYSTEM AND APPARATUS THEREFOR Original Filed Nov. 18, 1924 4Sheets-Sheet 2 May 31, 1932.

Original Filed NOV. 18, 1924 E. E. KLEINSCHMIDT SEILEGTIVE SYSTEM ANDAPPARATUS THEREFOR 4 Sheets-Sheet 3 May 31, 1932.

E. E. KLEINSCHMIDT 1,860,464

SELECTIVE SYSTEM AND APPARATUS THEREFOR Original Filed Nov" 18, 1924 4Sheets-Sheet 4 Patented May 31, 1932 UNITED srArEs EDWARD E.KLEINSCHMIDT, OF CHICAGO, ILLINOIS,

ASSIGNOR TO TELETYPE COR- PORATION, OF CHICAGO, ILLINOIS, A CORPORATIONOF DELAWARE SELECTIVE SYSTEM AND APPARATUS THEREFOR Refile for abandonedapplication Serial No. 750,625, filed November 18, 1924. Thisapplication filed November 30, 1928.

- The present invention disclosed in the present case which issubstituted for application Ser. No. 750,625, relates to selectivesystems and apparatus therefor.

More particularly, the invention relates to selective systems andapparatus particularly useful for printing telegraphs.

The objects of the invention are to provide novel driving and controlmeans for rotary transmitter and selector elements; toprovide novelmethods of establishing concordance of action between the rotatingtransmitter and receiver elements to provide novel transmitting andreceiving apparatus; and such other objects as may be. attained byutilization of the various combinations and'subcombinations hereinafterset forth.

Broadly the invention consistsin substituting for the alternatingcurrent drives disclosed in U. S. Patent #1,? 03,152, issued Feb. 26,1929 to Edward E. Kleinschmidt, either a direct reed driving means orreed controlled driving means. Because of the light weight of parts andsmall amount of energy necessary to actuate the rotary elements of theapparatus as disclosed in the cop-ending appli-' cation,'it is possibleto drive these elements mechanically by a reed vibrating freely for theperiod of one selective combination. The energy of the drive may howeverbe increased by the use of magnetic drive circuits for the reed.

Referring to the drawings Fig. 1 is a more or less diagrammatic planview showing the essential parts of a keyboard transmitter adapted foruse in the improved system.

Fig. 2 is a sectional front elevation with parts broken away to show thedriving means. Fig. 3 is a plan elevation showing essential elements ofan improved receiver.

Fig. 4 is a side elevation with parts broken away of the receiver shownin Fig. 3.

Figures 5 and 6 illustrate modifications in which the reed vibration isunder the control of selective impulses.

Fig.7 illustrates a modification in which the vibrating reed controls amagnetic drive circuit.

Serial No. 322,947.

synchronous Transmitting apparatus Referring to Fig. 1, numerals 1 to 6denote a plurality of transversely movable permutation bars each bearinga plurality of cam surfaces 7. A plurality of letter or signal bars 8are mounted to co-act with the cam surfaces on bars 1 to 6, so that whenthe bars 8 are depressed, bars 1 to 6 are moved transversely in variouscombinations in accordance with a predetermined code as is well known inthe art. Bar 6 is a universal bar and is moved transversely by thedepression of each key or signal bar 8. As bar 6 moves transversely tothe left on depression of a key, it engages pawl 9. Pawl 9 is movedforward by 6 and actuates bell crank 10, upon which 9 is pivotallymounted at 11-. Bell crank moves about its pivoted point 12 and openscontacts 13. As pawl 9 is moved to the left its cam surface 14 rides onfixed pin 15 and stresses spring 16. After contacts 13 have been openedthe cam action of pin 15 on surface 14 moves pawl 9 about point 11 torelease the pawl from actuating engagement with bar 6. In this manner,if a key is held depressed after the selective combination controlledthereby has been sent, contacts 13 will be free to close and a secondcharacter will not be sent. When the key is released pawl 9 and bellcrank 10 will be returned to normal position under influence of thecontact sprin and spring 16. The usual keyboard interloc k (not shown)ma be provided to guard against release of a epressed key before thecombination has been completely transmitted.

Opening of contacts 13 interrupts a circuit through reed drive magnet17, conductors 18,

and battery 19. Magnet 17, when energized 'holds reed 20 in stressedposition and when deenergized permits reed 20 to move to the left inFig. 1. As the reed moves to the left a contact 21 carried therebyengages fixed contact 22 and completes an energizing circuit throughconductor 23, magnet 17, conductor 18, battery 19, conductor 23, andreed 20. The reed will then be attracted causing interruption of thecircuit at contacts 21 and 22, and will vibrate at a predetermined ratewhich may be varied by shifting the position of weight 24 in well knownmanner.

Pivotally mounted on reed is a forked double acting pawl member 25. Asreed 20 moves to the right in Fig. 2, the uppenarm of 25 pushes on atooth of driving wheel 26 and the lower arm of 25 is moved fromengagement with one tooth and rides over the next tooth on 26. On thereturn movement of 20, the lower branch of 25 pulls on the tooth it hasridden over, and the upper branch moves away from the tooth it pushedand rides over the next tooth. the reed 20 will rotate Wheel 26 anangular distance of one tooth.

Mounted in bearings, or supports (not shown) so as to be rotatably andaxially movable, is a pin barrel 27. Toothed wheel 26 is is rigidlyfastened to, and rotates barrel 27. Mounted on barrel 27 in angularlyand axially displaced relation to each other is a series of pins 28 to34. Barrel 27 is normally held in retracted axial position by a contactmember through the action of spring 36. Line contacts 37 are normallyclosed with 27 in retracted position. In normal resting position of thepin barrel, pin 28 engages a latch member 38 and prevents locking ofcontacts 13.

When as above described, contacts 13 have been permitted to open byactuation of bar 6, reed 20 commences to vibrate and rotates the pinbarrel. On the first step, 28 moves out of engagement with 38 which thenlocks contacts 13 in open position. Pin 29 then engages a fixed cammember 39. This causes axial movement of the pin barrel and therebyopens contacts 37 causing a preliminary or start condition on the line.After 29 has passed cam 39, barrel 27 is axially restored through actionof spring 36, and contacts 37 are again closed. The pin barrel continuesto rotate and pins 30 to 34 successively pass' by cam members 40 to 44carried by bars 1 to 5. As shown in Fig. 1, bars 2, 4 and 5 are actuatedand in this condition interpose cams 41, 43 and 44 respectively in thepaths of pins 31, 33 and 34. As each pin passes a corresponding actuatedbar (1 to 5) an axial movement ofthe pin barrel will be caused,

actuating contacts 37 to send code combinations of marking and spacingconditions ,on the line of transmitting medium. It will be obvious thatthe relative times occupied by marking, spacing, start, and stopcondition .may be varied at will by increasing or decreasing the widthof cams 39 to 44 in varying proportions to suit varying line conditions.Block signals or separated interval signals may obviously be sentdepending on proportions of the parts. Reversed polarity impulses mayalso be used if desired, in an obvious manner. After the last impulse ofa combination has been sent contacts 37 remain Each vibration ofclosed,and the pin barrel rotates under control of the vibrating reed until pin28 engages latch 38 and permits contacts 13 to close. Even if the key isheld depressed contacts 13 will close, magnet 17 will energize stoppingvibration of reed 20 and rotation of the pin barrel, and the key must bereleased to permit re-engagement of bar 6 and pawl 9 before another codecombination can be sent. It will of course be understood that the partsare shown in schematic form and distorted relation to better illustratethe invention. For the sake of clearness supports have been omitted andonly so much of well known apparatus has been illustrated as is requiredto clearly show the invention.

Because of the lightness of parts, the drive circuit comprising contacts21 and 22 and conductors 23 may be eliminated, and the energy stored inthe reed 20 may alone be relied upon to complete rotation of the pinbarrel.

Receiving apparatus In the embodiment of apparatus shown in Figures 3and 4, a reed drive circuit for the receiver rotary member the same asthat used at the transmitter is utilized. The description need not behere repeated, but for convenience, the same numerals with added theretohave been utilized to designate like parts. By eliminating contacts 121,122 and conductors 123,,the free vibration of reed will rotate thereceiver cam shaft between the start and stop positions.

Incoming code combinations of electrical impulses operate line magnet toactuate armature 152 about a. pivotal point, under influence of spring153, in obvious manner. Movement of 152 (as shown in Fig. 3) caused by astarting line condition, permits cam shaft 154 to move axially to theright under influence of member 155 and spring 156, moving pin 157 andpermitting contacts 113 to open the holding circuit through magnet 117.Cam shaft 154 then rotates under the influence of the reed drivearrangement in definitely timed relation with respect to the change ofline conditions caused by the transmitter. As the cam shaft rotates,cams 158 to 162 successively pass trips 163 to 167. If a-markingcondition exists on the line as a. cam passes its trip, axial movementof the cam shaft Will be permitted by 150 and the respective cam iscaused to align with and actuate its respective trip. If a spacingcondition exists on the line as a cam passes the trips 163 to 167 areset latches 168 individual to each trip operate to retain the set tripsin actuated position. Trips 163 to 167 control a plurality of movableslotted selector bars 169. The selector bars 169 control a plurality ofactuating bars 17 0 which in turn control the desired selectiveoperation. A selector.

of this type is fully disclosed in my U. S. Patent #1,567,392, issuedDec. 29, 1925, to which reference may be had for details of the selectorand mechanism controlled thereby. Only so much of the selector mechanismis here shown as will enable a complete understanding of the inventionto be had in its specific controls the actuating energy for completing;

a selected operation. In the apparatus shown 172 operates bail 173 whichin turn com letes the operation of a selected actuating ar 170. Theselector mechanism may control a printing telegraph machine of the typesshown in my U. S. Patents No. 1,565,- 165, issued Dec. 8, 1925; No.1,564,442 issued Dec. 8, 1922; and No. 1,448,750, issued March 20, 1923,in which case, bars 170 would actuate the type-bars, and magnet 172would be the printer magnet.

Pin 157 then closes contacts 113 causing magnet 117 to energize and tohold the parts in zero position until a start condition of'a succeedingcode combination is received.

In Fig. 0' a modification of the drive arrangement shown in Fig 3 isdisclosed. In this form conductor 123 connects contact 122 to a contact175. With the cam shaft shifted to the right, arm 155 engages contact 175 and completes a circuit for magnet 117 through arm 155 and conductor176. When the cam shaft is to the left, arm 155 is out of engagementwith contact 175. The remaining parts are the same as set forthinconnection with Figures 3 and 4. In operation an energizing circuit formagnet 117 will be completed each time a spacin condition is received.The reed and the rotation of the cam will accordingly be under linecontrol between the start an stop signals, and will be corrected by theselecting impulses if it should be out of phase. In the arrangementshown in Fig. 3, the vibrations of the reed and rotation of the camshaft are under solely local control between the start and stoppositions. By positioning contact 175 so that movement of arm 155 to theright interrupts engagement therewith and movement to the left closesthe circuit, correction will. occur on marking impulses.

In Flg. 6 a form 1s shown in which a me- Fig. 7,

tacts 181 and 182 are 'circuits are thenchanical stop 177, such as shownin my copending application, Ser. No. 704,022, filed April 3, 1924, issubstituted for the holding circuit through contacts 113 of the formshown in Fig. 5. The proportion of parts is such that in zero ositionpin 157 will be held against stop 17 pawl 125 will be hooked over atooth on wheel 126 holding reed 120 away from magnet 117 with contact121 engaging contact 122, and arm 155 will be disengagedfrom contact 175. Upon the receipt of the first or start condition magnet willde-energize permitting the cam shaft to shift to the right. Pin 157 willpass through notch 178 and arm will engage contact 175. Magnet 117 willnow attract reed 120 causing interruption of the drive circuit. The reed120 will vibrate and cause a complete rotation of the cam shaft inunison with the received impulses until the cycle is complete and theparts come to rest in the position shown. Contacts and arm 155 will beengaged only when the cam shaft is to the right or when spacingconditions are received, and accordingly the rotation of the cam shaftwill be line controlled in rotation between the start and stoppositions. When the drive circuit is opened the step ing of the camshaft will continue due to e free vibration of reed 120. By connectingconductor 176 directly to conductor 123, the control of rotation ofthe-cam shaft by the se ,control a neutral or a polarized stepping magnet or other driving means, such for example,

as is shown in the copendingapplication. In

reed 120 has springs 179 and 180 applied' thereto which alternatelv enage contacts 181 and182 as the reed vibrates. Conconnected by conductors183 and 184 to coils 185 and 186 of a polarized drive magnet 187 of thetype disclosed in the copending application.

The other endsof coils 185 and 186 are connected to battery 119 throughconductor 118. As in the copending case, pawl 125 is pivotally supportedon armature 188 of magnet 187. 'Windings 185 and 186 are applied in suchmanner that when energized, the polarities of the magnetic fields set upare opposite in character. Inoperation, the cam shaft moves endwise inresponse to a re ceived start condition, de-energizing magnet 117 andpermitting reed 120 to vibrate. The completed alternatelythroughwindings 185 and 186, conductors 183 and I84- conductor 123through battery 119 and conductor 118, causing armature'188 to vibratein unison with the reed. Pawl 125 will rotate the cam shaft in properlytimed relation contacts 182 and'181, reed 120,

'lecting impulses is removed, and the rotation with the receivedimpulses until a revolution has been completed and pin 157 closes theholding circuit for magnet 117 through contacts 113 in response to thestop condition.

It will be obvious that the drive arrangement of Fig. 6 may be appliedto the transmitter pin barrel by substituting contacts 13 of Fig. 1 andthe controlling means therefor for contacts 113 and the control of Fig.6.

Sim unit continuous system In the arrangements shown in Figures 1 to 5,a seven unit start-stop system is shown. A lower frequency system may beprovided by eliminatiiig the extra receiver stop condition after eachimpulse and depending upon a mechanical and electrical stop operable onthe fifth selecting impulse. The mechanical stop of the fifth pulse ispreferably of the type disclosed in'co-pendlng application, SerialNumber 704:,022, filed April 3, 1924. The essential parts of such asystem aredisclosed in Fig. 8. Any usual form of automatic transmittermay be used which will transmit the selective code combinations at aproper rate, each preceded by a receiver start condition always of thesame character. The speed of the transmitter is preferably controlled bya vibrating reed drive. The arrangement is the same as that shown inFig. 6 except that mechanical stop 177 is positioned to stop the camshaft immediately after the fifth selecting impulse has set thecorresponding finger on receipt of a marking condition and after theselecting mechanism has been set into operation by the closing ofcontacts 171 (Fig. 3), also contacts 113 are added. In arrested positioncontacts 113 are closed and complete a holding circuit for magnet 117.Each time the cam shaft moves to the right in response to a spacingcondition, an energizing circuit will be completed through contact 1175and arm 155 for magnet 117.

The reed 120 is normally biased toward contact 122 so that when theparts are at rest with magnet 117 de-energized, spring 121 will engagecontact 122. To start the reed 120 into vibration the line is openedpermitting magnet 150 to de-energize and arm 155 to engage contact 175.This will start rotation of the receiving cam shaft. The line may thenbe closed and pin 157 will be brought into engagement with stop 177 andwill close contacts 113. The first impulse of each signal will causede-energization of magnet 150,

- causing the cam shaft to move to the right in Fig. 8. Pin 157 will permit'contacts 113 to open and will drop off shelf 177. Continuoustransmission may now proceed, and the reed 120 will be corrected andhave energy supplied thereto to maintain vibration each time a spacingcondition is received during the first four selecting intervals of .asignal, and each time the fifth selecting interval is a markingcondition. The system will accordingly remain in synchronism duringtransmission and may be readily brought in unison to start transmission.

Having described preferred embodiments of my invention, what isdesiredtobe se- .paratus responsive to said selecting conditions, andmaintained in synchronism with said transmitting apparatus by saidsynchronizing condition and by certain of said selecting conditions.

2. A telegraph system comprising transmitting apparatus adapted totransmit code combinations of selecting conditions; a vibratingreedtiming the rate of operation of said transmitting apparatus;receiving apparatus responsive to said code combinations; a vibratingreed timing the rate of operation of said receiving apparatus in unisonwith said transmitting apparatus; and means for initiating andcontrolling the vibrations of said reed responsive to certain of saidselecting conditions, and unresponsive to others of said selectingconditions.

3. A telegraph system comprising transmitting apparatus adapted totransmit code combinations of selecting conditions each preceded by areceiver start condition, and a receiver responsive to said selectingconditions comprising a reed initiated in vibration by said startcondition and timed in operation by certain of said selectingconditions.

4. In a selective apparatus, a rotary element, a vibrating reed timingthe speed of operation of said rotary element, a nolding magnet for saidreed, and a pair of contacts controlled by said rotary elementcontrolling said magnet. 5. Selecting apparatus comprising an axiallyand rotary movable means, a vibratory member timing the rotary movementof said means, a holding magnet for said vibratory member, and contactscontrolling said holding member and controlled by the axial movement ofsaid means.

6. The combination as set forth in claim 1, which said receivingapparatus is corrected by the last selecting condition of a codecombination.

7. The combination as set forth in claim 1,

- reed together with an actuating magnet for said reed connected in saidsupply circuit.

10. A transmitting apparatus, comprising a selecting mechanism, means tooperate said selecting mechanism in accordance with the signals to betransmitted, a driving motor for said transmitter, control contacts forsaid motor, means for actuating said contacts at the beginning of asignal to initiate operation of said motor, and locking means tomaintain said contacts in position to continue the operation of saidmotor until the completion of a signal independently of the operation ofsaid first mentioned means.

. 11. The combination as set forth in claim 10, together with means forinvariably actuating-said locking means to arrest the operation of saidmotor at the end of each signal independently of the operation of saidfirst mentioned means.

12. In a selecting system, a rotary member, a series of elements adaptedto be operated by said rotary member, a signal controlled member actingto selectively control said series of elements according to the signalsreceived, and a member having a natural period of motion adapted to timethe operation of said rotarv member, and mechanical connections betweensaid member and said rotary member to transmit the power to drive saidrotary member. i

13. In combination, a plurality of selecting members, a rotatingmemberresponsive to received code combinations of impulses fordistributing said impulses to said elements and a member having anatural period of motion directly connected to said rotating member forsupplying the power'to drive said member.

14. In combination, a plurality of selecting members, a rotatabledistributor responsive to received code combination of impulses fordistributing said impulses to said members and a tuning forkmechanically connected to said distributor for rotating saiddistributor.

15. In combination, a plurality of select ing members, a rotatabledistributor responsive to received code combination of impulses fordistributing said impulses to said members, a tuning fork mechanicallyconnected to said distributor for rotating said distributor, circuitconnections for normally maintaining said tuning fork non-operative andmeans responsive to a received signal for rendering said tuning forkoperative to operate said distributor.

16. In a selecting system, a rotatable cam shaft, a plurality ofselector members selectively operated by said cam shaft, a vibratingmember mechanically connected to said shaft for driving said shaft,electro-magnetic means responsive to received signals for controllingsaid vibrator and electrical connections for said electro-magnetic meanscontrolled by said cam shaft.

17 In a selecting system, a rotatable cam shaft, a plurality of membersselectively operated by said cam shaft, electro-magnetic meansresponsive to received signals for operating said cam shaft to operatesaid selector members, a vibrating member mechanically connected to saidshaft for driving said shaft,

electro-magnetic means for controlling said vibrator and circuitconnections for said electro-magnetic means controlled by said camshaft, said electro-magnetic means being normally held non-operativewhile said cam shaft .remains at rest, and responsive to a receivedstart signal for renderin said vibrator operative for a single cycle 0operations.

18. In a signalling system, a source of power comprising a vibratingmember, a rotating member directly driven by said vibrating member, andan electric magnet responsive to a line signal for releasing sufficientpower from said vibrating member to drive said rotating member onerevolution.

19. A transmitting apparatus comprisin a selecting mechanism, means tooperate said selecting mechanism in accordance with a signal to betransmitted, a source of power comprising a vibrating member directl andmechanically connected to said transmitting mechanism for operating saidtransmitting mechanism and means operative at thebeginning of a signalperiod forreleasing suflicient of said power from said vibratingmechanism to operate said transmitting meichanism until the completionof the signal co e.

20. A transmitting apparatus comprising a selecting mechanism, and arotatable shaft for operating said selecting mechanism in accordancewith signals to be transmitted, a source of power for said rotatableshaft and means for releasing sufficient of said power at the beginningof a signal to maintain said rotating member in rotation for onerevolution for transmitting a code combination" of impulse conditions.

21. In a signalling system, a rotatable member, a vibrating member, forsupplying the power to rotate said rotatable member and circuitconnections for controlling the vibration of said vibrating member saidcircuit connections being jointly controlled by said vibrating memberitself and by received impulses.

22. In a signalling receiver, a rotatable member, an electro-magnetresponsive. to received combinations 0 impulse conditions, a vibratingmember for directly rotating said rotatable member and means controlledby said electro-magnet for controlling the operation of said vibratingmember.

23. In a signalling receiver, an electromagnet responsive to receivedcombination of impulse conditions, a rotatable member arranged to beoperated by said electro-magnet, a vibrating member for rotating saidrotatable member and means controlled by said received impulseconditions, for controlling the operation of said vibrating memberduring the operations of said rotatable memr. 24. In a signallingsystem, a rotatable member, a vibrating memberfor rotating saidrotatable member, a magnet for controlling the vibration of saidvibrating member, a normally open electric circuit for said magnet, andmeans responsive to a received signal for closing said circuit wherebysaid v1 rating member is started into operation, said vibrating memberwhen in operation periodically opening said magnet circuit to maintainitself in operation.

25. In a signalling system, a rotatable member, a vibrating member forrotating said rotatable member, a magnet for controlling the vibrationof said vibrating member, a normally open electric circuit for saidmagnet, and means responsive to a received signal for closing saidcircuit whereby said vibratin member is started into operation, said vi'rating member when in operation periodically opening said magnetcircuit to maintain itself in operation said last mentioned means beingoperative at the end of v a signal period to open said circuit.

26. In a selecting system, a signalling line, a rotating member, meansfor variably operatin said rotating member, means controlle bfy thevariable operation of said member or transmitting code combinations ofconditions over said line, a rotating member at the other end of saidline, a series of selecting elements, a vibrating member for each ofsaid rotating members, mechanical connections between each said saidvibrating members and its associated rotating member for driving saidrotating members, one of said vibrating members being arranged tooperate its associated rotating member entlrely in accordance with itsmechanical constructions, means controlled by said received codeconditions for controlling the operation of said second vibrating memberto operate in s chronism with said first vibrating mom r whereby saidrotating members are maintained in synchronism and means res nsive toreceived code conditions for varia 1y operating -said selecting"elements.

27 In a signalling system, a transmitting station, a receiving station,a rotating member at each station, vibrating means at each station, eachhaving a natural period of v1brat1on for driving said rotating membermeans whereby one of said vibrating members is free to vibrate and meanswhereby the other of said vibrating members is controlled in accordancewith the vibration of the first mentioned vibrating member.

28. In a signalling system, a transmitting station, a receiving station,a vibrating member at each of said stations, a rotary member at eachstation driven directly by said vibrating members, said vibrating memberat said transmitting station being free to vibrate, means controlled bysaid rotary member at said transmitting station for transmitting codecombinations of conditions to said receiving station and meanscontrolled by said received code combinations of conditions forcontrolling the rate of vibration of said reber, and selector membersvariably operated by said rotating member at said receiving station inaccordance with the received code combinations of conditions.

30. In a signalling system, a transmitting station, a receiving station,a vibrating member at each of said stations, a rotary-member at eachstation driven directly by said vibrating members thereat, saidvibrating member at said transmitting station being free to vibrate,means controlled by said rotary member at said transmitting station fortransmitting code combinations of impulse conditions preceded by a startimpulse condition,

an "electro-magnet at said receiving station responsive to said startconditions and received code combinations of impulse cond1- tions forreleasing the vibrating member,

thereat to vibrate through a single revolution and for maintaining saidvibrating member in synchronism with said transmitting station vibratingmember whereby said rotary members are maintained in synchronism.

31. In a signalling system, a transmitting station, a receiving station,a vibrating member at each of said stations, a rotary member at eachstation driven directly by said vibrating members thereat, saidvibrating member at said transmitting station being free to vibrate,means controlled by said rotary member at said transmitting station fortransmitting code combinations of impulse conditions preceded by a startimpulse condition;

an electro-magnet at said reeciving station responsive to said startimpulse conditions for releasing the vibrating member, and circuitconnections for said electro-magnet independent of said last meanswhereby said electro-magnet is operated in accordance withsaid receivedcode combinations of impulse conditions for maintaining said vibratingmember in timed relation with said re ceived signals whereby saidtransmitting and receiving station rotary members are driven insynchronism.

32. In a selecting apparatus, a signalling line; two oscillatingmembers, one at .each end of said line, one of said members having itsoscillations determined by its mechanical construction, the other memberhaving its oscillations controlled by line signals; a plurality ofgroups of selectable elements, a group associated with each oscillatingmember; a mechanically operative connection between each oscillatingmember and its group of elements; and means for transmitting linesignals in accordance with the setting of one group of elements, wherebythe other group of elements is set in accordance with said signals.

33. In a selective apparatus, a signalling line; two oscillatingmembers, one at each end of said line, one of said members having itsoscillations determined by its mechanical construction, the other memberhaving its oscillations controlled by line signals; a group ofselectable elements associated with each oscillating memberfmeans fortransmitting line signals in accordance with the setting of one group ofelements; and a single member having its movements controlled by both ofsaid oscillating members and acting to set and operate the other groupof said elements in accordance with line signals.

34. In a selecting apparatus, a signalling line, means for transmittingsignals over said line, a series of elements to be selected, two

oscillating members, one of said oscillating members havingitsvoscillations determined by its mechanical construction, the otheroscillating member having its oscillations controlled by the linesignals; mechanically operative connections between said elements andsaid two oscillating members whereby said elements are selected andoperated accord ing to the line signals.

35. In a selecting apparatus, a signalling line, means for transmittingsignals over said 'line, a series of elements to be selected, two

oscillating members, one of said oscillating members havingitsoscillations determined by the line signals, the other oscillatingmember having its oscillations determined by its mechanicalconstruction; a single member having its motion controlled by both ofsaid oscillating members and. acting to set and operate said elementsaccording to the signals.

36. A transmitting apparatus, including a selecting mechanism, means tooperate said selecting mechanism in accordance with a signal to betransmitted; a single element operable to produce signal impulses, anoscillating member having its rate of oscillations determined by itsmechanical construction and adapted to cooperate with said selectingmechanism to control the operation of said element according to thesignal to-be transmitted.

37. A transmit-ting apparatus, including a selecting mechanism, means tooperate said selecting mechanism in accordance with a signal to betransmitted; two oscillating members, one of said members having itsoscillations determined by its mechanical construction, a single memberhaving its movements controlled by said one of said oscillating membersand said selecting mechanism to control the oscillations of the other ofsaid oscillating members according to the signal to be transmitted.

38. A transmitting apparatus, including a selecting mechanism, means tooperate said selecting mechanism in accordance with a signal to betransmitted; a single element, two oscillating members, one of saidoscillating members having its oscillations determined by its mechanicalconstruction and adapted to cooperate with said selecting mechanism tocontrol the movements of said single member to thereby control theoscillations of the other of said oscillating members according to thesignal to be transmitted.

In testimony whereof I affix my signature.

EDWVARD E. KLEINSOHMIDT.

